abrracing

Hi everyone, we live in Toronto Ontario and could use some help. We have a 1994 1LE Z28 race car that we bought and have been racing the past 1.5 years. This car was built before we got it, we didnt touch the driveline jsut restored it back to its former glory. We are having all kinds of gremlins with it and are having a tough time to find someone locally who really knows these engines inside and out. We know the engine was refreshed before we got it. We know it has a bigger throttle body, GM "hot" cam, porting to the stock intake and heads. We now seem to have a bad injector with is bright yellow in color and I am told not a stock injector. Anyone have any idea what this injector could be? Flow rate etc?
Yes it has a 1998-2002 nose on it, the previous owner updated it after their many off road incidents lol

93M6Formula

I think the only injectors that are yellow were the Accels which are complete JUNK. My uncle was having issues with his '93 after he bought some accel injectors he thought he needed. Never ran right after that, went to SVO redtops and never had an issue. Not the only time i've heard of bad accel products either... Hard to tell what size you have without getting them flowed. They're probably about a 30LB. The stock ones would have been fine for that setup.

abrracing

So you think the stock injectors would flow enough fuel to support this set up?

waltsfastz

iTrader: (4)

Your car is pretty sweet.
The stockers would be fine, However if it were tuned for say 30Lb injectors and ou went back with a stock it would have to be retuned. Im running Accell 36 Lb injectors and they have worked ok.

Shownomercy

iTrader: (1)

Ford yellow tops are 19#

abrracing

Any idea what the stock GM injectors would be lbs?

Catmaigne

iTrader: (6)

22lb or 24lb, it depends on year. I would upgrade the injectors but whether or not it's necessary really depends on how the heads were ported. You can get away with stockers with some bland porting and a hotcam. I'd be more concerned about the shitty stock fuel pump.

93M6Formula

A '93 LT1 is 22LB '94-'97 is 24LB. That's at 47PSI I believe.

Jazz-LT1

iTrader: (2)

Also, if you change the injectors from the stockers any significant change will require a change in the program as well. You can't just pull 24# injectors and drop in 30# injectors and get a performance increase. It's not like jetting a carb.

moehorsepower

iTrader: (3)

They are rated at 43.5 PSI, you are correct on the year vs size...

bufmatmuslepants

iTrader: (3)

Moe, could you tell by the injector constant to get an idea of what size they would be? OP you can see that if you get an ALDL cable and download the free software, I don't know enough about tuning to know if there's anything in the tune that would give you an idea what size they are.

moehorsepower

iTrader: (3)

The only yellow injectors I know of are the Accell, but Shownomercy says ford 19lb are also yellow, the only way is if he sends me the pcm or he get software and in the IFR table it will tell you...

abrracing

Thank you all for your input! The problem is we bought the car with the engine built and don't have a lot of information, its always trying to find out what someone else has done. I am getting ready to rip it all out and start again knowing what was done each step of the way!

abrracing

Well we learned a few things!

1. an OBD2 computer out of a 1996 Z28 works well in my OBD1 1994 Z28

2. the 30lb injectors that we replaced our crappy 36lb Accel injectors with gave us an additional 28 horsepower and 22 ftlbs of torque! We went from 320 rwhp and 340 ftlbs of torque to 348.9 rwhp and 362.2 ftlbs torque. This was using the same Mustang Dyno we used the 1st time.

3. You can't get into an OBD2 computer with an OBD1 wiring harness lol